Chain pipe-wrench



G L. ALBERT, E. H-. ALLEN AND A. ARMSTRONG.

CHAIN PIPE WRENCH.

APPLlcATloN FILED ocr. 21. 1919.

Patented Jain. 4, 1921 In venfars W/fnesses I 0% IGIEPETERS Inc. um: nsmvmmn UNITED STATES PATENT OFFICE.

GEORGE LINCOLN ALBERT, OF DAYTON, AND EDVTARD HARISON ALLEN, AND ALBERT ARMSTRONG, OE GERMAN'IO'WN, OHIO.

CHAIN PIPE-WRENCH.

Specification of Letters Patent.

Patented Jan. 4, 1921.

Application filed October 27, 1919. Serial No. 333,814.

T 0 all w 7mm it may concern:

Be it known that we, GEORGE LINooLN ALBERT, EDWARD HARTsoN ALLEN, and AL- BERT ARMSTRONG, GEORGE LINooLN ALBERT residing in the city of Dayton, county of Montgomery, and State of Ohio, and ED- WARD HARISON ALLEN and ALBERT ARM- STRONG residing in the town of Germantown, county of Montgomery, and State of Ohio, have invented certain new and useful Improvements in Chain Pine-Trenches, of which the following is a specification.

The principal object of our invention is to provide a chain pipe wrench which produces a uniform clench or pressure around the entire circumference of the object gripped. The wrench effects a positive, as well as a non-slipping or non-creeping grip on a pipe or tube which it will not dent or crush in one place more than in another.

Our improved wrench can be applied on the edge of flanges or on nuts of union couplings, to effect a firm grip upon them without theassistance of any other tool. Nipples and elbows it will readily olench, and to any narrow space on a pipe, that is equal to the width of the chain, it may be effectively applied. Since the wrench con tains no corrugated jaws or blocks to fulcrum or rest upon the pipe, it will not injure the latter or its threads.

The device is simple in construction and operation, and will readily accommodate itself to different sizes of pipes where a chain of suflicient length is provided.

Other important and incidental objects will be brought out in the following specification, and particularly set forth in the subjoined claim.

Referring to the accompanying drawings, Figure 1 is an end view of a pipe to which our improved chain wrench has been applied. Fig. 2 is a top plan View of the clevis to which one end of the chain is secured and through which the other end of the chain is passed. And Fig. 3 is a view looking down upon the bar or handle, the chain and the clevis.

Throughout the specification and drawings, similar reference characters denote corresponding parts.

Referring {to the accompanying dirawings, the numeral 1 designates a pipe or tube around whose circumference a chain 2 is passed. This chain is connected at one end to the bowed portion of a clevis 3 that is pivotally secured to the lower end of a bar, lever or handle 4 by means of a bolt 5. The bar 4 terminates at its lower end in a forked portion 6 adapted to straddle any one of the chain links 2 that engages the periphery of the pipe.

In operation, the chain 2 is slipped over a pipe, coupling or other object to be clenched or gripped, after which its free end is passed through the bowed portion of the clevis 3. After the chain is drawn in a fairly tight manner around the pipe, one of its vertically disposed links is straddled by the forked end of the bar 4. Pressure is then applied to the outer end of the bar 4 in the direction of the arrow in Fig. 1, whereupon, with the bolt 5 acting as a fulcrum, the forked end of the bar will engage the horizontal link, above it, to draw the chain into sufficiently firm engagement with' the periphery of the pipe, to turn the latter. Since the chain encircles the pipe, and the pressure against the fulcrum is .resisted by the end of the chain connected to the clevis 3, the clench or grip upon the pipe will be uniform throughout its circumference, to the end that it will not be dented or crushed in one place more than in another. Furthermore, a large gripping. surface is presented to increase the area of frictional contact, with the result that the chain will not slip or creep when power is applied to the handle. The pull is thus equally distributed throughout the entire circumference of the object gripped, which is not the case where jaws or blocks re attached to the end of the bar, or lever.

Since the distance A in Fig. 1 is approximately one third greater than the distance B, the chain 2 will be permitted free movement through the bowed portion of the clevis 3 even when the bar 41 is brought into its lowermost position. To provide the proper leverage, the distance O in Fig. 3, or that between the bolt 5 and the upper end of the slot in the bar 4:, should be approximately one-half of the distance B.

Any flat-link, oblong-link or other suitable chain may be employed with our clawbar lever to accomplish the results we obtain, without departing from the spirit of the invention. Furthermore, any other change or modification in the construction and arrangement herein shown and described, may be made within the scope of the subjoined claim.

Having claim:

In a device of the type described, the combination with a lever, of a one piece clevis, a bolt pivotally securing the clevis to the lower end of said lever, a link chain, one end of which is secured to the clevis While its other end passes through the latter toward the end of the lever, and a forked lower end on said lever projecting obliquely to the longitudinal axis of the latter, and

described our invention, We

adapted to straddle a link on said chain and to engage the adjacent link, for'the purpose specified.

In testimony whereof we have hereunt0'15 set our hands this 25th day of October,

GEORGE LINCOLN ALBERT. EDXVARD HARISON ALLEN. ALBERT ARMSTRONG. \Vitness:

HOWARD S. SMITH. 

